How we can develop JSP pages using Custom Tags?

Answer 1

What is a Custom Tag?

The custom tag is a convention that allows you to have the container call the tag library life cycle event methods (for example, doStartTag), including the attribute get/set calls automatically invoked when attributes are declared in the custom tag. doStartTag and doEndTag methods are called when the JSP page request is processed.

Ex:

< tagHandlerPrefix:customTagName / >

The above is a simple custom tag with no tag body.

Ways to use Custom Tags:

There are 4 ways of using Custom tags. They are:

1. < libraryPrefix : handlerName />

The custom tag with no body, said to be an empty custom tag.

2. < libraryPrefix : handlerName parameterName="value" >

This tag causes the container to call the setParameterName method and pass the "value" to it.

3. < libraryPrefix : handlerName parameterName="value" >

< % = 23 * counter % >

< b > Congratulations ! < / b >

< / libraryPrefix : handlerName >

A custom tag with a body. The body can contain core tags, scripting elements, HTML text, and tag-dependent body content between the start and end tags.

4. < library : outerTag >

< library : innerTag >

< / library : innerTag > < / library : outerTag >

This syntax is how you nest custom tags. The XML is easy, but the handler is more involved. Note that the following is wrong: .